The compiler is failing to draw the connection between
slice cap and slice len, so is missing some obvious BCE opportunities.
Give it a hint by making the cap equal to the length.
The generated code is smaller and cleaner, and a bit faster.
name old time/op new time/op delta
Decode/tcp4-8 12.2ns ± 1% 11.6ns ± 3% -5.31% (p=0.000 n=28+29)
Decode/tcp6-8 12.5ns ± 2% 11.9ns ± 2% -4.84% (p=0.000 n=30+30)
Decode/udp4-8 11.5ns ± 1% 11.1ns ± 1% -3.11% (p=0.000 n=25+24)
Decode/udp6-8 11.8ns ± 3% 11.4ns ± 1% -3.08% (p=0.000 n=30+26)
Decode/icmp4-8 11.0ns ± 3% 10.6ns ± 1% -3.38% (p=0.000 n=25+30)
Decode/icmp6-8 11.4ns ± 1% 11.1ns ± 2% -2.29% (p=0.000 n=27+30)
Decode/igmp-8 10.3ns ± 0% 10.0ns ± 1% -3.26% (p=0.000 n=19+23)
Decode/unknown-8 8.68ns ± 1% 8.38ns ± 1% -3.55% (p=0.000 n=28+29)
While the code was correct, I broke it during a refactoring and
tests didn't detect it. This fixes that glitch.
Signed-off-by: David Anderson <danderson@tailscale.com>
Doesn't materially affect benchmarks, but shrinks match6 by 30 instructions
and halves memory loads.
Part of #19.
Signed-off-by: David Anderson <danderson@tailscale.com>
Part of #19.
name old time/op new time/op delta
Filter/icmp4-8 32.2ns ± 3% 32.5ns ± 2% ~ (p=0.524 n=10+8)
Filter/icmp6-8 49.7ns ± 6% 43.1ns ± 4% -13.12% (p=0.000 n=9+10)
Signed-off-by: David Anderson <danderson@tailscale.com>
Cache DNS results of earlier login.tailscale.com control dials, and use
them for future dials if DNS is slow or broken.
Fixes various issues with trickier setups with the domain's DNS server
behind a subnet router.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
As documented in the README, tailscale only build with the latest Go
version (Go 1.15). As a result, a handful of undefined errors would pop
up using an older verison.
This patch updates the base image to 1.15, allowing "docker build"
to function correctly once more.
Signed-off-by: Sean Klein <seanmarionklein@gmail.com>
This fixes the problem where, while running `redo version-info.sh`, the
repo would always show up as dirty, because redo creates a temp file
named *.tmp. This caused the version code to always have a -dirty tag,
but not when you run version.sh by hand.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
Instead of reverting to 0.0.0, keep the same version number (eg. 1.2.4)
but add an extra suffix with the change count,
eg. 1.2.4-6-tb35d95ad7-gcb8be72e6. This avoids the problem where a
small patch causes the code to report a totally different version to
the server, which might change its behaviour based on version code.
(The server might enable various bug workarounds since it thinks
0.0.0 is very old.)
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
This option isn't available on slightly older versions of git. We were
no longer using the real describe functionality anyway, so let's just do
something simpler to detect a dirty worktree.
While we're here, fix up a little bit of sh style.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
These accidentally make the tag syntax more flexible than was intended,
which will create forward compatibility problems later. Let's go back
to the old stricter parser.
Revert "cmd/tailscale/cli: fix double tag: prefix in tailscale up"
Revert "cmd/tailscale/cli, tailcfg: allow tag without "tag:" prefix in 'tailscale up'"
This reverts commit a702921620.
This reverts commit cd07437ade.
Affects #861.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
The packet filter still rejects all IPv6, but decodes enough from v6
packets to do something smarter in a followup.
name time/op
Decode/tcp4-8 28.8ns ± 2%
Decode/tcp6-8 20.6ns ± 1%
Decode/udp4-8 28.2ns ± 1%
Decode/udp6-8 20.0ns ± 6%
Decode/icmp4-8 21.7ns ± 2%
Decode/icmp6-8 14.1ns ± 2%
Decode/unknown-8 9.43ns ± 2%
Signed-off-by: David Anderson <danderson@tailscale.com>
In 1.0, subnet relays were not specially handled when WPAD+PAC was
present on the network.
In 1.2, on Windows, subnet relays were disabled if WPAD+PAC was
present. That was what some users wanted, but not others.
This makes it configurable per domain, reverting back to the 1.0
default state of them not being special. Users who want that behavior
can then enable it.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
In tests, we force binding to localhost to avoid OS firewall warning
dialogs.
But for IPv6, we were trying (and failing) to bind to 127.0.0.1.
You'd think we'd just say "localhost", but that's apparently ill
defined. See
https://tools.ietf.org/html/draft-ietf-dnsop-let-localhost-be-localhost
and golang/go#22826. (It's bitten me in the past, but I can't
remember specific bugs.)
So use "::1" explicitly for "udp6", which makes the test quieter.
This change is to make JSONHandler error handling intuitive, as before there would be two sources of HTTP status code when HTTPErrors were generated: one as the first return value of the handler function, and one nested inside the HTTPError. Previously, it took the first return value as the status code, and ignored the code inside the HTTPError. Now, it should expect the first return value to be 0 if there is an error, and it takes the status code of the HTTPError to set as the response code.
Signed-off-by: Daniel Chung <daniel@tailscale.com>
The goal is to move some of the shenanigans we have elsewhere into the filter
package, so that all the weird things to do with poking at the filter is in
a single place, behind clean APIs.
Signed-off-by: David Anderson <danderson@tailscale.com>
